Filtering apparatus.



PATENTED OCT. 25, 1904..

2 SHEETS-SHEET 1 No. 773,473. A PATENTED OUT. 25, 1904. H. R. GASSBL.

PILTERING APPARATUS.

APPLICATION TILED JULY 15, 1904.

N0 MODEL.

2 SHEETS-SHEET 2.

Z & fnvenlom- UNTT D STATES Patented October 25, 1904.

PATENT @FFMIE.

FILTE RING APPARATUS.

SPEQIFIGATION forming part of Letters Patent No. 773,473, dated October25, 1904:.

Application filed July 1f5 ,,l.904=. Serial No. 216,641; (No model.)

1'0 fbfl/ whom it may concern.-

Be it known that I, HENRY R. CAssEL, a citizen of the United States,residing at Colorado Springs, Colorado, have invented new and usefulImprovements in Filtering Apparatus, of which the following is aspecification.

This invention relates to an apparatus for extracting the values fromslimes in a simple and etficient manner.

In the accompanying drawings, Figure 1 is a front elevation of myimproved apparatus; Fig. 1, a detail of the pulp-distributer; Fig. 2, asectional elevation of parts of the apparatus, showing the bottom of thefiltering-tank open; Fig. 8, a cross-section through the filtering-tankon line 3 3,, Fig. 2; Fig. 4:, a side view of a filter-cell, showing thepulp-detacher; Fig. 5, an enlarged vertical cross-section thereof; Fig.6, a side view of a modification oi' the pulp-detacher, and Fig. 7 adetail of a modification of the pulp-distributer.

The letter (4 represents a filtering-tank, the coniform bottom a ofwhich is provided with a flange a IVithin tank a are fitted a num ber offilter-cells B, each composed of a rigid skeleton b and a surroundingfilter 6, formed of filter-cloth, perforated metal, or other ma- Yfiltering-tank a.

terial. Into the upper end of each cell B, Fig. 2, enters a tube 0,having cock 0', and extending with its lower end to a point slightlyabove the bottom of the cell. At their upper ends the tubes 0 areconnected to a common suction-pipe (Z, which is closed at one end andcommunicates at its other end with asuctionpump 0, that by pipe fdelivers the filtrate to a suitable solution-tank. (Not shown.)

g is the pulp-tank, having valve g and communicating by pipe with thelower end of A water-tank 7L also communicates by pipe 5, having cockwith tank (0.

Against the bottom flange a of tank a fits a vertically-movable andlaterally-displaceable tapering bottom or door This door is providedwith a pair of axles t", carrying traction-wheels 2' that travel on atrack 2'. To the door 2: is secured the removable section j of apulp-discharge pipe, which may be connected to the fixed section j ofsaid pipe by a suitable coupling f Below pipe-section 3' there dependsfrom door 2' a rotatable arbor vi", carrying fast bevel-wheel The lowerthreaded end i of arbor z is tapped into a stand '5 the wholeconstituting a lifting-jack. The bevel-wheel i is engaged by a wheel ithe spindle i of which has a handle If the handle 2' is turned in onedirection, the door 2' is raised against flange a to close tank a. Inthis position the wheels are slightly raised off track 71", Fig. 1. Ifthe handle is turned in the other direction, the door is lowered untilthe wheels redescend upon track 1".

The discharge-pipe y'y" communicates with a centrifugal pump 7c, whichin turn communicates with a pipe Z. This pipe has a cock Z and opensinto pulp-tank 9. Below cock Z there extends from pipe l a branch Zhaving a pulp-distributer or nozzle Z" and cock Z. The nozzle Z is madeof tapering or triangular form in cross-section, Fig. l, and may beprovided with a door Z to permit cleaning and the removal ofobstructions. The upper and lower sides of nozzle 6 converge toward thefront, where they form a long narrow discharge-slit. The nozzle opensinto the top of tank a above the cells B and is connected to the Wall ofthe tank by suitable flanges Z Fig. 3. By means of this nozzle the pulpis distributed evenly over the filtering-cells B.

Fig. 7 illustratesamodification of the pulpdistributer. Here the nozzleZ is dispensed with, while the branch Z of pipe Z is extended along thetop of tank a. From branch Z project a number of nipples so arrangedthat the pulp is delivered above, but between cells B.

A pipe 117., having cock m, communicates with pipe Z and opens intowater-tank 7L.

Flat against each side of cell B is placed a vertically-movable mantleor pulp-detachera, which may be formed of a coarse-wire screen or othermaterial adapted tocut the pulp. This screen may be moved up and downalong the cell and may be slightly agitated to completely sever the pulpfrom the cell. In order to guide the screen during its movement, thecell B may be provided with guide-rails b Suitable means may be providedfor imparting the required movement to the mantle. The

drawings show the mantles fitted in rectangular frames 0, which areprovidedwith hangers 0, having bent ends 0 ceived by a pair ofperforated rails 79, engagcorners of tank a. Each of the rails 2 may bevertically reciprocated to impart a corresponding motion to mantles n.The means for actuating rails 7) are shown to consist of crank-shaft pdriven by pulleys p and connected to rails p by links 79*. Instead ofusing the mantles 72 the detachers may be made in the formdiagrammatically illustrated in Fig. 6. Here a scraper 9, made of wireor a knifeblade, is placed against each side of the cells near the upperend thereof. The wire 7 is attached to two suspending-wires passing oversheaves (1 and carrying at one end eounterweights (1. At their otherends the wires q engage a windlass J, the two windlasses thus requiredbeing intergeared, if desired. By manipulating the windlasses the wire 0will be drawn down to sever the cake deposited upon the side of cell B.

The operation is as follows: The pulp is discharged into tank a tosubmerge cells B. The door a is closed, the cocks Z m are closed, andthe cock 1" is opened. The pump a is started to draw the liquid from thepulp into cells B, from which it is carried to the solution-tank. Inorder to prevent the settling of the pulp at the bottom and to provide acirculation of the pulp between the cells, the centrifugal pump Z isalso set in motion. This will cause the pulp to be withdrawn from thebottom of tank a and to be redelivered to the tank at its top abovecells B through nozzle or nipples Z During this operation the pulpgradually thickens against the mantles 72, additional pulp beingsupplied to always keep the cells immersed. hen a layer of sufiicicntthickness has accumulated, the valve 7* is closed and valve Z opened,whereby the non-adhering pulp is lifted into the pulp-tank 9. Duringthis operation suction in cells B is maintained to prevent portions ofthe cakes from becoming detached. After the non-adhering pulp has thusbeen removed valve Z is closed and valves m bf are opened to admit waterinto tank ('4 and wash out the values still contained in the cakes.These values will, by pump a, be drawn into cells B. When the valueshave been extracted, the valve ll is closed and the water is returnedfrom tank a through pump kinto tank 72.. The pump Z: is now stopped andthe coupling 7' is opened. The door 7; is lowered by turning handle 7'so that the wheels 7? will descend upon track 71. The door 7' is drawnby suit-able means along the track away from tank a, a car 7 is pushedunder the tank. Fig. 2, and pump 0 is stopped. The agitators w or q areset in motion to detach the cakes from the cells B and cause thedetached fragments to fall into car 7'. If desired, the loosening of thecakes from These ends are reing guides 9, that project upwardly from the3 the cells may be etfectecl by pumping air into the latter.

In lieu of using the bevel-gear jack shown any other screw, hydraulic orpneumatic ram may obviously be employed.

\Vhat I claim is- 1. A filtering apparatus comprising a tank, inclosedfiltering-cells, a suction-pump connected thereto, a bottom removablyfitted to the tank, and means for withdrawing the pulp from said bottomand delivering it to the top of the tank, substantially as specified.

2. A filtering apparatus comprising a tank, inclosed filtering-cells, asuction-pump connected thereto, aremovable bottom, means for raising andlowering the bottom, and means for withdrawing the pulp from said bottomand delivering it to the top of the tank, substantially as specified.

3. A filtering apparatus comprising a tank, inclosed filtering-cells, asuction-pump connected thereto, a removable bottom, a jack secured tosaid bottom, and means for with drawing the pulp from said bottom anddelivering it to the top of the tank, substantially as specified.

4. A filtering apparatus comprising a tank, inclosed filtering-cells, asuction-pump connected thereto, a removable bottom having wheels and ajack, a track adapted to be engaged by the wheels, and means for withdrawing the pulp from said bottom and delivering it to the top of thetank, substantially as specified.

5. A filtering apparatus comprising a tank, inclosed filtering-cells, asuction-pump connected thereto, a removable bottom having wheels and ajack, a track adapted to be engaged by the wheels, a discharge-pipeconnected to the bottom, and means for withdrawing the pulp from saidbottom and delivering it to the top of the tank, substantially asspecified.

6. A filtering apparatus comprising a tank, inclosed filtering-cells, asuction-pump connected thereto, a pulp-distributer at the top of thetank, and means for connecting said distributor with the bottom of thetank, substantially as specified.

'7. A filtering apparatus comprising a tank, inclosed filtering-cells, asuction-pump connected thereto, a pulp-distributer at the top of thetank, a removable bottom, means for raising and lowering the bottom, andmeans for connecting the bottom to the pulp-distributer, substantiallyas specified.

8. A filtering apparatus comprising a tank, inclosed filtering-cells, asuction-pump connected thereto, and a tapering nozzle having adischarge-slit which opens into the top of the tank, substantially asspecified.

9. A filtering apparatus comprising a tank, inclosed filtering-cells. asuction-pump connected thereto, a tapering nozzle having a dischargeslitwhich opens into the top of the tank, and means for connecting thebottom of the tank to said nozzle, substantially as specified.

- 10. Afilteringapparatuscomprisingatank, a removable bottom havingWheels, a track adapted to be engaged by the Wheels, a movabledischarge-pipe section secured to the bottom, a fixed discharge-pipesection adapted to be connected thereto, a nozzle entering the top ofthe tank, and means for connecting the fixed pipe-section to saidnozzle, substantially as specified.

11. A filtering apparatus comprising a tank, inclosed filtering-cells, asuction-pump connected thereto. cutting-screens at'the sides of thecells, and means for agitating the screens, substantially as specified.

12. In a filtering apparatus,the combination of afiltering-tank withinclosed filtering-cells, a suction pump connected thereto, a pulptank,a Water-tank, a removable bottom for the filtering-tank, a pipe forconnecting said bottom with the pulp-tank, and a pulp-distributercommunicating With the pipe and entering the top of the filtering-tank,substantially as specified.

13. A filtering apparatus comprising a pulptank, means Within the tankfor separating the liquid from the pulp by suction, means fordischarging the liquid, means for Withdrawing'the pulp from said bottomand delivering it to the top of the tank, and means for discharging thesolid residue through the bottom of the tank, substantially asspecified.

Signed by me at Colorado Springs, Colorado, this 22d day of June, 1904:.

HENRYR. CASSEL. Witnesses:

CHARLES W. HAINES, ELsIE STEVENSON.

